{"id":"CVE-2026-89505","title":"RDMA/uverbs: Guard legacy bundles without method_elm","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Guard legacy bundles without method_elm\n\nThe legacy write() path dispatches through a uverbs_api_write_method, but\nthe uverbs_attr_bundle passed to provide…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-824"],"vendor":"Linux","product":"Linux","affected":["Linux >= 7122ff96068a03595bde2fbafaca82ca2ed8084e < edae84e5461749ed9adf9fcf5c6e075381040ac3","Linux >= 7122ff96068a03595bde2fbafaca82ca2ed8084e < 60a42d510113f46de47e86a84bf5758597644487","Linux 7.1"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:56.727Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89505","references":[{"url":"https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3"},{"url":"https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89505"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532252"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89505"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89505"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89505.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00198,"epssPercentile":0.09435,"ingestedAt":"2026-09-14T11:11:19.887Z","slug":"CVE-2026-89505","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Guard legacy bundles without method_elm\n\nThe legacy write() path dispatches through a uverbs_api_write_method, but\nthe uverbs_attr_bundle passed to provider code does not have an ioctl\nmethod element. If malformed provider input causes the common uverbs\nvalidation code to emit an error message, uverbs_get_handler_fn()\ndereferences the uninitialized method_elm pointer.\n\nInitialize method_elm explicitly for legacy bundles and make\nuverbs_get_handler_fn() return NULL when no ioctl method is present. The\nlegacy dispatcher continues to use its local write method, while the ioctl\npath continues to use the registered ioctl handler.\n\n## Affected\n\n- `Linux >= 7122ff96068a03595bde2fbafaca82ca2ed8084e < edae84e5461749ed9adf9fcf5c6e075381040ac3`\n- `Linux >= 7122ff96068a03595bde2fbafaca82ca2ed8084e < 60a42d510113f46de47e86a84bf5758597644487`\n- `Linux 7.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206942,"id":"CVE-2026-89505","ts":1789749710360,"field":"cvss","old":"4.7","new":"5.5"},{"seq":204053,"id":"CVE-2026-89505","ts":1789490231213,"field":"cvss","old":null,"new":"4.7"},{"seq":204052,"id":"CVE-2026-89505","ts":1789490231213,"field":"severity","old":"none","new":"medium"},{"seq":147582,"id":"CVE-2026-89505","ts":1789270211475,"field":"cvss","old":null,"new":"4.7"},{"seq":147581,"id":"CVE-2026-89505","ts":1789270211475,"field":"severity","old":"none","new":"medium"},{"seq":109334,"id":"CVE-2026-89505","ts":1789183731468,"field":"cvss","old":null,"new":"4.7"},{"seq":109333,"id":"CVE-2026-89505","ts":1789183731468,"field":"severity","old":"none","new":"medium"}]}